tabakrolletjie/lights.py

   1 """ May it be a light for you in dark places, when all other lights go out.
   2 """
   3
   4 import math
   5
   6 import pymunk
   7 import pymunk.pygame_util
   8 import pygame.display
   9 import pygame.draw
  10 import pygame.locals as pgl
  11 import pygame.rect
  12 import pygame.transform
  13
  14 from .constants import LIGHT_CATEGORY, FITTINGS_CATEGORY, COLOURS
  15 from .rays import RayPolyManager
  16 from .utils import DetailedTimer
  17 from .loader import loader
  18 from .transforms import ColourWedges
  19
  20 LIGHT_FILTER = pymunk.ShapeFilter(
  21     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  22         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  23     categories=LIGHT_CATEGORY)
  24
  25 FITTINGS_FILTER = pymunk.ShapeFilter(
  26     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  27         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  28     categories=FITTINGS_CATEGORY)
  29
  30 # Just match lights, nothing else
  31 LIT_BY_FILTER = pymunk.ShapeFilter(mask=LIGHT_CATEGORY)
  32
  33
  34 class LightManager(object):
  35     """ Manages a set of lights. """
  36
  37     def __init__(self, space, gamestate):
  38         self._space = space
  39         self._battery_dead = False
  40         self._lights = [
  41             BaseLight.load(cfg) for cfg in gamestate.station["lights"]]
  42         for light in self._lights:
  43             light.add(self._space)
  44
  45     def add_light(self, cfg):
  46         light = BaseLight.load(cfg)
  47         self._lights.append(light)
  48         light.add(self._space)
  49
  50     def battery_dead(self):
  51         self._battery_dead = True
  52         for light in self._lights:
  53             light.off()
  54
  55     def toggle_nearest(self, *args, **kw):
  56         if self._battery_dead:
  57             return
  58         light = self.nearest(*args, **kw)
  59         if light:
  60             light.toggle()
  61
  62     def nearest(self, pos, surfpos=False, max_distance=1.0):
  63         if surfpos:
  64             surface = pygame.display.get_surface()
  65             pos = pymunk.pygame_util.from_pygame(pos, surface)
  66         point_info = self._space.point_query_nearest(
  67             pos, max_distance, pymunk.ShapeFilter(mask=FITTINGS_CATEGORY))
  68         if point_info is not None:
  69             return point_info.shape.body.light
  70         return None
  71
  72     def lit_by(self, pos, surfpos=False, max_distance=0.0):
  73         if surfpos:
  74             surface = pygame.display.get_surface()
  75             pos = pymunk.pygame_util.from_pygame(pos, surface)
  76         point_info_list = self._space.point_query(
  77             pos, max_distance, LIT_BY_FILTER)
  78         lights = [p.shape.body.light for p in point_info_list]
  79         return [
  80             light for light in lights
  81             if light.on and light.ray_manager.reaches(pos)
  82         ]
  83
  84     def light_query(self, shape):
  85         """Query the lights by shape"""
  86         old_filter = shape.filter
  87         # We need to restrict matches to only the lights
  88         shape.filter = LIT_BY_FILTER
  89         shape_info_list = self._space.shape_query(shape)
  90         shape.filter = old_filter
  91         lights = [p.shape.body.light for p in shape_info_list]
  92         return [
  93             light for light in lights
  94             if light.on and light.ray_manager.reaches(shape.body.position)
  95         ]
  96
  97     def total_power_usage(self):
  98         return sum(light.power_usage() for light in self._lights)
  99
 100     def render_light(self, surface):
 101         for light in self._lights:
 102             light.render_light(surface)
 103
 104     def render_fittings(self, surface):
 105         for light in self._lights:
 106             light.render_fitting(surface)
 107
 108     def tick(self):
 109         for light in self._lights:
 110             light.tick()
 111
 112
 113 def light_fitting_by_type(light_type):
 114     """ Render a light fitting image for a light type. """
 115     return BaseLight.find_cls(light_type).FITTING_IMG
 116
 117
 118 class BaseLight(object):
 119     """ Common light functionality. """
 120
 121     # defaults
 122     RAY_MANAGER = RayPolyManager
 123     FITTING_IMG = None
 124     FITTING_RADIUS = 24.0
 125
 126     # cached surfaces
 127     _surface_cache = {}
 128
 129     def __init__(
 130             self, colours, position, intensity=1.0, radius_limits=None,
 131             direction=None, spread=None):
 132         self.colour_cycle = colours
 133         self.colour_pos = 0
 134         self.colour = colours[0]
 135         self.on = True
 136         self.intensity = intensity
 137         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 138         self.body.light = self
 139         self.ray_manager = self.RAY_MANAGER(
 140             self.body, position, ray_filter=LIGHT_FILTER,
 141             radius_limits=radius_limits, direction=direction, spread=spread)
 142         self.fitting = pymunk.Circle(
 143             self.body, self.FITTING_RADIUS, self.ray_manager.position)
 144         self.fitting.filter = FITTINGS_FILTER
 145         self._fitting_image = None
 146         self._colour_mult_image = None
 147
 148     @property
 149     def position(self):
 150         return self.ray_manager.position
 151
 152     @classmethod
 153     def load(cls, config):
 154         kw = config.copy()
 155         light_type = kw.pop("type")
 156         light_class = cls.find_cls(light_type)
 157         return light_class(**kw)
 158
 159     @classmethod
 160     def find_cls(cls, light_type):
 161         [light_class] = [
 162             c for c in cls.__subclasses__()
 163             if c.__name__.lower() == light_type]
 164         return light_class
 165
 166     def add(self, space):
 167         if self.body.space is not None:
 168             space.remove(self.body, *self.body.shapes)
 169         space.add(self.body, self.fitting)
 170         self.ray_manager.set_space(space)
 171         self.ray_manager.update_shapes()
 172
 173     def _cached_surface(self, name, surface):
 174         surf = self._surface_cache.get(name)
 175         if surf is None:
 176             surf = self._surface_cache[name] = pygame.surface.Surface(
 177                 surface.get_size(), pgl.SWSURFACE
 178             ).convert_alpha()
 179         return surf
 180
 181     def light_colour(self):
 182         light_colour = COLOURS[self.colour]
 183         intensity = int(255 * self.intensity)
 184         return light_colour + (intensity,)
 185
 186     def render_light(self, surface):
 187         if not self.on:
 188             return
 189
 190         dt = DetailedTimer("render_light")
 191         dt.start()
 192
 193         max_radius = self.ray_manager.max_radius
 194         min_radius = self.ray_manager.min_radius
 195         dest_rect = self.ray_manager.pygame_rect(surface)
 196
 197         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 198         light_colour = self.light_colour()
 199
 200         radius_mask = self._cached_surface('radius_mask', surface)
 201         radius_mask.set_clip(dest_rect)
 202         ray_mask = self._cached_surface('ray_mask', surface)
 203         ray_mask.set_clip(dest_rect)
 204
 205         ray_mask.fill(black)
 206         for pygame_poly in self.ray_manager.pygame_polys(surface):
 207             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 208             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 209         dt.lap("ray mask rendered")
 210
 211         radius_mask.fill(black)
 212         centre = self.ray_manager.pygame_position(surface)
 213         pygame.draw.circle(
 214             radius_mask, light_colour, centre, int(max_radius), 0)
 215         pygame.draw.circle(
 216             radius_mask, black, centre, int(min_radius), 0)
 217         dt.lap("radius mask rendered")
 218
 219         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 220         dt.lap("blitted radius mask to ray mask")
 221
 222         surface.blit(ray_mask, dest_rect, dest_rect)
 223         dt.lap("blitted surface")
 224         dt.end()
 225
 226     def fitting_image(self):
 227         if self._fitting_image is None:
 228             self._fitting_image = loader.load_image(
 229                 "48", self.FITTING_IMG,
 230                 transform=ColourWedges(colours=self.colour_cycle))
 231         return self._fitting_image
 232
 233     def invalidate_fitting_image(self):
 234         self._fitting_image = None
 235
 236     def render_fitting(self, surface):
 237         rx, ry = self.ray_manager.pygame_position(surface)
 238         surface.blit(self.fitting_image(), (rx - 24, ry - 24), None, 0)
 239
 240     def power_usage(self):
 241         if not self.on:
 242             return 0.0
 243         area = math.pi * (self.ray_manager.max_radius ** 2)  # radius
 244         area = area * (self.ray_manager.spread / (2 * math.pi))  # spread
 245         return 5 * area * self.intensity / 6400  # 80x80 unit area
 246
 247     def base_damage(self):
 248         return 10 * self.intensity
 249
 250     def off(self):
 251         self.on = False
 252
 253     def toggle(self):
 254         self.colour_pos += 1
 255         if self.colour_pos >= len(self.colour_cycle):
 256             self.colour = self.colour_cycle[0]
 257             self.colour_pos = -1
 258             self.on = False
 259         else:
 260             self.colour = self.colour_cycle[self.colour_pos]
 261             self.on = True
 262
 263     def tick(self):
 264         pass
 265
 266
 267 class Lamp(BaseLight):
 268
 269     FITTING_IMG = "lamp.png"
 270
 271
 272 class PulsatingLamp(BaseLight):
 273
 274     FITTING_IMG = "lamp.png"
 275     DEFAULT_PULSE_RANGE = (20, 100)
 276     DEFAULT_PULSE_VELOCITY = 2
 277     DEFAULT_INTENSITY_RANGE = (0.0, 0.9)
 278     DEFAULT_INTENSITY_VELOCITY = 0.1
 279
 280     def __init__(self, **kw):
 281         self.pulse_range = kw.pop("pulse_range", self.DEFAULT_PULSE_RANGE)
 282         self.pulse_velocity = kw.pop(
 283             "pulse_velocity", self.DEFAULT_PULSE_VELOCITY)
 284         self.intensity_range = kw.pop(
 285             "intensity_range", self.DEFAULT_INTENSITY_RANGE)
 286         self.intensity_velocity = kw.pop(
 287             "intensity_velocity", self.DEFAULT_INTENSITY_VELOCITY)
 288         super(PulsatingLamp, self).__init__(**kw)
 289
 290     def _update_range(self, value, velocity, value_range):
 291         value += velocity
 292         if value < value_range[0]:
 293             value = value_range[0]
 294             velocity = -velocity
 295         elif value > value_range[1]:
 296             value = value_range[1]
 297             velocity = -velocity
 298         return value, velocity
 299
 300     def tick(self):
 301         self.ray_manager.max_radius, self.pulse_velocity = self._update_range(
 302             self.ray_manager.max_radius, self.pulse_velocity, self.pulse_range)
 303         self.intensity, self.intensity_velocity = self._update_range(
 304             self.intensity, self.intensity_velocity, self.intensity_range)
 305
 306
 307 class SpotLight(BaseLight):
 308
 309     FITTING_IMG = "spotlight.png"
 310
 311     def __init__(self, **kw):
 312         self.angular_velocity = kw.pop("angular_velocity", None)
 313         super(SpotLight, self).__init__(**kw)
 314
 315     def fitting_image(self):
 316         fitting_image = super(SpotLight, self).fitting_image()
 317         rot_fitting_image = pygame.transform.rotozoom(
 318             fitting_image, self.ray_manager.direction - 90, 1)
 319
 320         rot_rect = fitting_image.get_rect().copy()
 321         rot_rect.center = rot_fitting_image.get_rect().center
 322         rot_fitting_image = rot_fitting_image.subsurface(rot_rect).copy()
 323
 324         return rot_fitting_image
 325
 326     def tick(self):
 327         if self.angular_velocity:
 328             self.ray_manager.direction -= self.angular_velocity
 329             self.ray_manager.update_shapes()